Critical Flaw in All Blizzard Games Could Let Hackers Hijack Millions of PCs

A Google security researcher has discovered a severe vulnerability in Blizzard games that could allow remote attackers to run malicious code on gamers’ computers.

Played every month by half a billion users—World of Warcraft, Overwatch, Diablo III, Hearthstone and Starcraft II are popular online games created by Blizzard Entertainment.

To play Blizzard games online using web browsers, users need to install a game client application, called ‘Blizzard Update Agent,’ onto their systems that run JSON-RPC server over HTTP protocol on port 1120, and “accepts commands to install, uninstall, change settings, update and other maintenance related options.”